flashloan-rs 0.2.3

Minimal Multicall3 Flashloan Module
Documentation 
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// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {Auth, Authority} from "../Auth.sol";

/// @notice Role based Authority that supports up to 256 roles.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/authorities/RolesAuthority.sol)
/// @author Modified from Dappsys (https://github.com/dapphub/ds-roles/blob/master/src/roles.sol)
contract RolesAuthority is Auth, Authority {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event UserRoleUpdated(address indexed user, uint8 indexed role, bool enabled);

    event PublicCapabilityUpdated(address indexed target, bytes4 indexed functionSig, bool enabled);

    event RoleCapabilityUpdated(uint8 indexed role, address indexed target, bytes4 indexed functionSig, bool enabled);

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(address _owner, Authority _authority) Auth(_owner, _authority) {}

    /*//////////////////////////////////////////////////////////////
                            ROLE/USER STORAGE
    //////////////////////////////////////////////////////////////*/

    mapping(address => bytes32) public getUserRoles;

    mapping(address => mapping(bytes4 => bool)) public isCapabilityPublic;

    mapping(address => mapping(bytes4 => bytes32)) public getRolesWithCapability;

    function doesUserHaveRole(address user, uint8 role) public view virtual returns (bool) {
        return (uint256(getUserRoles[user]) >> role) & 1 != 0;
    }

    function doesRoleHaveCapability(
        uint8 role,
        address target,
        bytes4 functionSig
    ) public view virtual returns (bool) {
        return (uint256(getRolesWithCapability[target][functionSig]) >> role) & 1 != 0;
    }

    /*//////////////////////////////////////////////////////////////
                           AUTHORIZATION LOGIC
    //////////////////////////////////////////////////////////////*/

    function canCall(
        address user,
        address target,
        bytes4 functionSig
    ) public view virtual override returns (bool) {
        return
            isCapabilityPublic[target][functionSig] ||
            bytes32(0) != getUserRoles[user] & getRolesWithCapability[target][functionSig];
    }

    /*//////////////////////////////////////////////////////////////
                   ROLE CAPABILITY CONFIGURATION LOGIC
    //////////////////////////////////////////////////////////////*/

    function setPublicCapability(
        address target,
        bytes4 functionSig,
        bool enabled
    ) public virtual requiresAuth {
        isCapabilityPublic[target][functionSig] = enabled;

        emit PublicCapabilityUpdated(target, functionSig, enabled);
    }

    function setRoleCapability(
        uint8 role,
        address target,
        bytes4 functionSig,
        bool enabled
    ) public virtual requiresAuth {
        if (enabled) {
            getRolesWithCapability[target][functionSig] |= bytes32(1 << role);
        } else {
            getRolesWithCapability[target][functionSig] &= ~bytes32(1 << role);
        }

        emit RoleCapabilityUpdated(role, target, functionSig, enabled);
    }

    /*//////////////////////////////////////////////////////////////
                       USER ROLE ASSIGNMENT LOGIC
    //////////////////////////////////////////////////////////////*/

    function setUserRole(
        address user,
        uint8 role,
        bool enabled
    ) public virtual requiresAuth {
        if (enabled) {
            getUserRoles[user] |= bytes32(1 << role);
        } else {
            getUserRoles[user] &= ~bytes32(1 << role);
        }

        emit UserRoleUpdated(user, role, enabled);
    }
}